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Normal Topic Select object by code vb.net (Read 3028 times)
dzapata2007
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Select object by code vb.net
May 19th, 2009 at 8:46pm
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Excuse me, i'm new in using this software.

How can I make vb.net code to search a node, and once found to change image and text through code? could give an example
  
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Stoyo
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Re: Select object by code vb.net
Reply #1 - May 20th, 2009 at 5:28am
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If you assign some Tag values to nodes, you could use the FindNode method to find a node:

Code
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Dim n As ShapeNode
n = Diagram1.FindNode(1)
If n IsNot Nothing Then
	n.Image = Image.FromFile("image.png")
	n.Text = "new label"
End If


If you need to search for nodes by some other criteria, do a for-each loop over diagram.Nodes and check if the node meets the condition.

I hope that helps,
Stoyan
  
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dzapata2007
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Re: Select object by code vb.net
Reply #2 - May 20th, 2009 at 3:18pm
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Dear Stoy,

When you run the example I gave (with the considerations of the case in relation to the Tag of the nodes) the problem I have is that Visual Basic 2008, you sent me the following error:

"Unable to cast object of type 'MindFusion.Diagramming.WinForms.Samples.VB.IconNodes.IconNode' to type 'MindFusion.Diagramming.ShapeNode."

FindNode () returns an object IconNode rather ShapeNode, with which I do not have access to the properties of the found object.

Thanks for your great and fast support.
  
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Stoyo
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Re: Select object by code vb.net
Reply #3 - May 20th, 2009 at 3:39pm
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If you are going to use only IconNodes, just define Dim n As IconNode. Otherwise use the TypeOf .. Is operator to check the type of the returned node, and then CType it to the correct type to use the appropriate properties.

I hope that helps,
Stoyan
  
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dzapata2007
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Re: Select object by code vb.net
Reply #4 - May 20th, 2009 at 3:44pm
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Dear Stoyo,

We apologize for the inconvenience, was the simple fix, just change the line defining the variable "n":

Dim n as IconNode

And everything worked properly.

Thanks for your support.
  
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